The nucleus contains the gene that codes for the enzyme and is where transcription happens to produce mRNA . The mRNA leaves the nucleus and attaches to a ribosome on the rough endoplasmic reticulum. The ribosome is where translation occurs as the mRNA is used to assemble a chain of amino acids, thus the mRNA is translated into a protein which in this case is an enzyme.The protein is then transported to the Golgi apparatus via a vesicle. The Golgi apparatus modifies and repackages the protein. The packaged protein leaves the Golgi apparatus via a vesicle which pinches off. The vesicle containing the packaged protein (enzyme) then fuses with the cell surface membrane and the enzyme is released.